A: Euro-II norms are framed to reduce the content of CO and aromatic compounds from fuels.
R: These compounds lead to reduced visibility and carboxyhemoglobin formation.
A: Nitrate and phosphate discharge in a water body causes eutrophication.
R: This increases the inorganic content in the water body and hence the growth of algal blooms.
A: Biomagnification of DDT can enhance the decline in the bird population.
R: DDT causes thickening of eggshells and their delayed breaking by disturbing calcium metabolism.
Biomagnification of DDT can reduce the bird population because it causes thinning of the eggshell.
A: Ecological sanitation is a sustainable system for handling human excreta.
R: It is a practical and hygienic method of using dry composting toilets.
A: El Nino is a climatic change which causes deleterious environmental changes.
R: Increased tropospheric ozone due to El Nino causes a shift of climatic regions.
A: ESP can remove the particulate matter by more than 99%.
R: Anode attracts the particles and provides a positive charge with the same & allow them to fall.
A: Montreal Protocol suggested the reduction of ODS.
R: A landmark international agreement taken in Earth summit held at Rio de Janeiro.
A: High concentration of atmospheric SO2 reduces primary productivity.
R: SO2 converts the chlorophyll-a into phaeophytin.
High concentration of atmospheric SO2 reduces primary productivity because SO2 converts the chlorophyll and phaeophytin by replacing Mg.
A: Intensive agriculture leads to negative soil pollution.
R: It increases useful mineral contents in the top layer of soil.
A: Irrigation without proper drainage of water leads to waterlogging in the soil.
R: Water logging results in increased soil salinity.
Irrigation without proper water drainage leads to waterlogging in the soil, increasing soil salinity.
A: PAN is a secondary pollutant.
R: PAN is formed by the interaction of nitrogen oxides and hydrocarbon in the absence of light.
PAN is produced by photochemical reactions.
A: Taj Mahal is being destroyed by SO2 coming from the Mathura refinery.
R: This converts CaCO3 into unstable calcium sulphate.
SO2/SO3 + H2O → H2SO4 [Acid rain]
A: A few toxic substances often present in industrial waste, waters undergo biological magnification.
R: A toxic substance can easily be metabolised or excreted by an organism.
A: High concentration of atmospheric SO2 and NOx causes acid rain.
R: It causes damage to foliage and growing points of plants.
Acid rain damage foliage and growing points of plants.
A: Polyblend is a fine powder of recycled plastics.
R: The blend of polyblend and bitumen helped increase road life by three factors.